Tractor with chain-track drive



May 7, 1929.

V. JERECZEK TRACTOR WITH CHAIN TRACK DRIVE Filed Feb. 25, 1927 PatentedMay 7, 1 929. e

umrso PATENT .oFF1c v.- w

vi'x ron annnoziix, or wniss'nnsnn, NEA BEItLIN; GERMANY, nssien'on Tosroox MOTORPFIJUG 'AKTIENGESELLSCHAFT, or G RMA Y. v

OF "BERLIN, j GERM NY, A oonroneirron rnnoron wrirn' CHAIN-TRACKLDB-IVE.-

. Application filed February 25, 1927,*se1'-ia1 1vo.' 171,022, and inGermany a ateur; 192 5.

' My invention concerns a tractor chain track drive. Tractorsof thiskind hitherto known were in consequence of the strong vehicle frame andparticularly in accuse- -5 quence of the casings and guides .forthechaintracks hitherto necessary very heavy and therefore little suited astractors for commerce or agriculture, In addition. the rigid and-inaccessibleconstructionas a whole impeded the universal introductionof the chain track Vehicle.

The object of my invention isto produce a chain track vehicle which doesnot possess the disadvantages referred to and which'in consequence ofits light weight and simple construction may be employed as a tractoreverywhere. The invention consists essentially in that a two-wheeledmotor carriage is connected by struts or the like with an axle for thesecond pair of wheels, said axle being acted upon by a tensioning devicefor the chain tracks. The heavy vehicle parts and the guides for thechain tracks are dispensed with;

In order to enable the chain tracks to be well adaptedtto irregularitiesof the ground, thevehicle frame proper can be pivoted at 7 three pointson the vehicle axles. With narrow gauge and small wheel base it is thenpossible for the chain trackto' suit itself to irregularities of'theground and thereby sufficient stability of the vehicle is ensured.

As a result of the'free arrangement of the chain tracks it is possibleto mount the chain track wheelsoon their axles so that they aredisplaceableand thereby to alter the gauge.

It is therefore possible, when using the vehicle for agriculturalpurposes, in drawing, hoes, turnip lifters and so forth to suit it tothe width of the rows of the plants,

In the accompanying drawing one form of construction of the tractoraccording to my invention is illustrated diagrammatically by ,way ofexample. I H Fig. 1 is aside elevation; v

Fig. 2 is a plan partly in section, and I Fig, 3 isa rear elevationofthemachine. In a casing 2 carrying the motor 1 and the gears 2 and 2with the two couplings -12 and 12 for engaging in well, known manner oneor both of these 'gears'withthe main, power shaft 1 are journalledthetwo axles 3 and 3 for thetwo driving wheeled which are independentlydriven by said gear; A

' strut is connected with theeesing 21 The Y 10 and the axle 6. are sodisplaced'that the thread 13 a't'their outer ends, and by insertrearstrut hasthe form of a ,5 m which a bearing. block, lO is movably farranged. In the latter an -axlefl6 is journailed which, carries, thetwo chain guide wheels 7. On the block 10. acts-a spring 9, the otherend of which rests against a spring. collar .9 -connected Witha screwspindle 9 o The latter, can bescrewed in 'a distance piece 5 of strut 5,whereby the-spring'9 maybe tensioned; By this means the bearing'blockchain tracks 8 are always taut. The axle 6 1s spherically shaped at 6inside the correspondingly formed bearing block 10, so that it canadjust itself independently of the axle of the front wheels 4 andthereby permit the I adaption of the track chains to irregularities ofthe ground. I

The adjustment of the wheel gauge can be effected byunscrewing oroutwardly displac- 1ng clamping rings 11 disposed outside wheels 4 and 7on the axles thereof, thatfor this purpose are provided with a screw ingclamping rings 11 of appropriate thickness on the axles 3, 3 and totheinside of the wheels.

The guiding of the vehicle is effected in known mannerbybraking ordeclutching the drive; of one or other of the two driving wheels 4L 1 jo V Instead of the motor 1, having its'longitudinal axis across to thelongitudinal axis of the vehicle, a motor maybe used of which thelongitudinal axislies in the longi-' 90 tudinal axis of thevehicle. Inthis casethe Y drive of the driving wheels 41 is preferably r eflectedbymeans of pinions and by toothed ringsconnected-to the driving wheels.t r y Y 'Itis naturally immaterial? to the essence of the inventionwhether the driveof the tractor effected rom the fr t or real i axle ofthe vehicle. e

. 1. A tractor'with chain track drive, ic om- 100 r1s1ng1n combination,a carriagehaving two wheels, afmotor arranged on said carrlage andadapted to drive said two wheels,

a frame-like structure firmly connected tosaid carriage, an axle beingournalled only at its middle partin said frame-like struc-l v ture, twowheels 'fixedto said'axle, said two Wheels being arranged in thetrack'of the first said. two wheels, endless track laying I 7 110 Nmeans running over said wheels; and a ten said carriage, an axle beingbya ball joint.

journalled at its middle part in said framelike structure, two Wheelsfixed to said axle,

said two Wheels being arranged in the track of the first said twoWheels, endless track laying means running oversaid Wheels, and atensioning devicefor saidendless track laying means and; acting uponsaid ball joint, 1 1 Y a 3. A tractor with chain track drive, comprising1n oomblnation, a carriage having two Wheels, a mot-or arranged on saidcarriage and adapted to drive said two Wheels, sald Wheels beingshittably arranged on then axles, and means for holding said wheel'slnposition, a frame-like structure firmly connected to said carriage, anaxle being .journalled only at its middle part in, said frame-likestructure, lLWO WhQGlS fixed to said axle, said two Wheels beingshiftably arranged on its axle, and means for holding saidwheels inposition, endless track laylng means running over said wheels, and atensionrngdeyioe for saldiendless traeklaylng means.

, V In testimony wliereof I have ailixed my signature.

vrKToR JERnoz Kfl

